7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Octupole correlations and Collective Couplings in the rare earth nucleus <sup>154</sup>Dy

8 Jul 2014, 11:30
D Les 101

D Les 101

Oral Presentation Track B - Nuclear, Particle and Radiation Physics NPRP


Mr George Zimba (University of Johannesburg)

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There is currently less information available on the structure of 154Dy at low spins. The question still remains whether at low spins the structure exhibits permanent octupole deformation [1] or aligned tidal wave octupole phonons [2]. Intermediate spins of the nucleus 154Dy were populated via the 155Gd (3He, 4n) 154Dy reaction at 45 MeV at iThemba LABS using AFRODITE array spectrometer. The even-even nucleus 154Dy with 6 neutrons and 2 protons outside the closed shell is nearly spherical. The N = 88 isotones have remarkable features; They are at a peak in the |M(E3)| 2 transition strength of 0+1 → 3-1 transitions for even-even nuclei as a function of neutron number usually called octupole vibration [34]. This was first stated by Chasman theoretically [1] whereby the first excited states in some nuclei have an octupole deformed first excited state with a quadruple deformation in the ground state and shown experimentally for 154Gd88 [4]. The strong E3 properties have been described and explained as due to the nearness of &Delta J &pi=3 - shell model orbits to the Fermi surface. They also have very strong E0 transitions from the band built on the 0 +2 states to the ground state bands [3, 5]. The measurements we have made on 154Dy are motivated by the findings from our studies of the isotones 152Gd and 150Sm from [6] where we observed octupole correlations between the 0 +2 states and the lowest-lying negative parity band, commonly known as the octupole band.
[1] R. R. Chasman, Phys. Rev. Lett. 42, 630 (1979).
[2] S. Frauendorf, Phys. Rev. C77, 021304(R) (2008).
[3] S. P. Bvumbi et al., Phys. Rev. C 87, 044333 (2013).
[4] S P Bvumbi, “Spin and Parity Assignment in 152Gd Investigating Octupole Structures”; MSc thesis, University of Western Cape (2008).
[5] S. Frauendorf, Y. Gu, J. Sun, Tidal waves as yrast states in transitional nuclei (2007).
[6] S. P. Bvumbi, “Investigation of octupole correlations and collective couplings in the rare earth nucleus 150Sm” PhD thesis, University of Johannesburg, (2013).

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Mr George Zimba (University of Johannesburg)


Dr Elena Lawrie (iThemba LABS) Prof. John F Sharpey-Schafer (UWC) Dr Kobus Lawrie (iThemba LABS) Dr Paulus Masiteng (University of Johannesburg) Dr Pete Jones (iThemba LABS) Mr Siyabonga Majola (UCT/ iThemba Labs) Ms Suzan Phumudzo Bvumbi (University of Johannesburg) Mr Tshepo Dinoko (iThemba Labs)

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